1. The branched areas in the lungs are blood vessels and bronchi . 2. Unlike asthma, hypersensitivity pneumonitis targets lung alveoli rather than bronchi . 3. Muscle spasm and inflammation within the bronchi get worse this narrowing. 4. The respiratory tract begins with the trachea and bronchi . 5. In contrast to emphysema, asthma affects the bronchi , not the alveoli. 6. The bronchi branch off into smaller sections inside the lungs, called bronchioles. 7. The main bronchi have relatively large lumens that are lined by respiratory epithelium. 8. Hyaline cartilage is present in the bronchi , surrounding the smooth muscle layer. 9. These plates give structural support to the bronchi and keep the airway open. 10. They lay eggs into the airways ( bronchi ).
